| 摘要 |
<p>A PROBLEM OF THE INVENTION IS TO PROVIDE A PROCESS OF PRODUCING POLYESTERS HAVING A STABLE QUALITY AND A PROCESS OF PRODUCING POLYESTER WITH A GREATLY REDUCED LOAD AGAINST THE ENVIRONMENT. @THE INVENTION RELATES TO A PROCESS OR PRODUCING POLYESTER BY USING A POLYCONDENSATION REACTION APPARATUS PROVIDED WITH ONE OR MORE SETS OF AN EJECTOR, A CONDENSER PLACED IN THE DOWNSTREAM PORTION OF THE EJECTOR AND A HOT WELL TANK CONNECTED TO THE CONDENSER VIA A BAROMETRIC LEG AND INCLUDING A STEP OF DRIVING THE EJECTOR BY A VAPOR COMPOSED MAINTLY OF 1, 4-BUTANEDIOL, CONDENSING THE VAPOR COMPOSED MAINLY OF 1, 4-BUTANEDIOL AS DISCHARGED FROM THE EJECTOR IN THE CONDENSER PLACED IN THE DOWNSTREAM PORTION OF THE EJECTOR, AND MAKING THE REACTOR IN A REDUCEDPRESSURE STATE TO UNDERGO POLYCONDENSATION REACTION, CHARACTERIZED IN THAT THE CONCENTRATION OF TETRAHYDROFURAN CONTAINED IN A SEALING LIQUID IN AT LEAST ONE HOT WELL TANK IS NOT MORE THAN 4BY WEIGHT.</p> |
